React/Redux - 将变量传递给动作答案

【问题标题】：React/Redux - Pass variable to actionReact/Redux - 将变量传递给动作
【发布时间】：2023-03-13 07:10:02
【问题描述】：

我是 Redux 的新手，正在使用 Spotify API 进行项目。我正在发送 API 调用并检索有关当前播放歌曲的数据。

我有一个单独的 Redux 操作，它试图从当前播放的艺术家那里获取其他专辑。在我的 App.js 中，我可以通过 const id = this.props.currentlyPlaying.id 访问艺术家的 ID

我想将此变量从 App.js 传递给我的相册操作。该操作包含 API 调用，如下所示：

import SpotifyWebApi from 'spotify-web-api-js';
import {id} from '../App.js';
const spotifyApi = new SpotifyWebApi();

export function fetchAlbums() {
  return function(dispatch) {
    dispatch({ type: "FETCH_ALBUMS_BY_ARTIST"});

    //'43ZHCT0cAZBISjO8DG9PnE'
    spotifyApi.getArtistAlbums(id)
      .then((response) => {
        dispatch({ type: "FETCH_ALBUMS_BY_ARTIST_FULFILLED", payload: response})
      })
      .catch((err) => {
        dispatch({ type: "FETCH_ALBUMS_BY_ARTIST_REJECTED", payload: err})
      });

  }
}

我尝试导入 id 变量，但出现错误。将变量从组件传递到 Redux 操作的正确方法是什么？我也试过通过this.props直接在action中访问id，也不管用。

【问题讨论】：

标签： reactjs variables redux react-redux action

【解决方案1】：

不要尝试导入 id，在调用fetchAlbums 操作时将其作为参数传递。

类似：

动作：

export const fetchAlbums = (id) => async dispatch => {
  dispatch({ type: "FETCH_ALBUMS_BY_ARTIST"});

  //'43ZHCT0cAZBISjO8DG9PnE'
  spotifyApi.getArtistAlbums(id)
    .then((response) => {
      dispatch({ type: "FETCH_ALBUMS_BY_ARTIST_FULFILLED", payload: response})
    })
    .catch((err) => {
      dispatch({ type: "FETCH_ALBUMS_BY_ARTIST_REJECTED", payload: err})
    });
}

使用行动：

这将绑定一个函数来调用fetchAlbums 函数，允许您传递参数而不是click 事件。

<button onClick={() => fetchAlbums(id)}>Fetch Album</button>

【讨论】：

【解决方案2】：

您需要做的是，当您从组件调用操作时，将 th id 传递给操作函数。像这样：我还会推荐你使用 redux-thunk 中间件来处理异步操作。

export function fetchAlbums(id) {
  return function(dispatch,id) {
    dispatch({ type: "FETCH_ALBUMS_BY_ARTIST"});

    //'43ZHCT0cAZBISjO8DG9PnE'
    spotifyApi.getArtistAlbums(id)
      .then((response) => {
        dispatch({ type: "FETCH_ALBUMS_BY_ARTIST_FULFILLED", payload: response})
      })
      .catch((err) => {
        dispatch({ type: "FETCH_ALBUMS_BY_ARTIST_REJECTED", payload: err})
      });

  }
}

【讨论】：

【解决方案3】：

我的配置：

    "react": "^17.0.2",
    "react-dom": "^17.0.2",
    "react-redux": "^7.2.6",

我们可以像这样将值传递给调度函数，

切片文件

import { createSlice } from '@reduxjs/toolkit'

export const rootSlice = createSlice({
    name: 'root',
    initialState: {
        posts: [
            { id: 1, title: "sunt aut facere repellat provident occaecati excepturi optio reprehenderit", body: "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto" },
            { id: 2, title: "qui est esse", body: "est rerum tempore vitae\nsequi sint nihil reprehenderit dolor beatae ea dolores neque\nfugiat blanditiis voluptate porro vel nihil molestiae ut reiciendis\nqui aperiam non debitis possimus qui neque nisi nulla" },
            { id: 3, title: "ea molestias quasi exercitationem repellat qui ipsa sit aut", body: "et iusto sed quo iure\nvoluptatem occaecati omnis eligendi aut ad\nvoluptatem doloribus vel accusantium quis pariatur\nmolestiae porro eius odio et labore et velit aut" },
        ],
    },
    reducers: {
        deletePost: (state, action) => {
            console.log("state: " + state.posts)
            console.log("action: " + action.payload.id)
            console.log("action: " + action.payload.extra_val)
            // to do
            let newPost = state.posts.filter(post => {
                return action.payload.id !== post.id
            })
            return {
                ...state,
                posts: newPost
            }
        },
    },
})

// Action creators are generated for each case reducer function
export const { deletePost } = rootSlice.actions

export default rootSlice.reducer

发布文件

import React from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import { useSelector, useDispatch } from 'react-redux'
import { deletePost } from '../reducers/rootSlice'

const Post = () => {
    let navigate = useNavigate();
    let { post_id } = useParams();
    const posts = useSelector((state) => state.root.posts);
    var singPost = (id) => posts.find(obj => obj.id === parseInt(id))
    const dispatch = useDispatch()

    const handleClick = (id) => {
        dispatch(deletePost({ id, extra_val: 'ok-1' }));
        navigate("/");
    }

    const post = (id) => {
        var sp = singPost(id);
        return sp ? (
            <div className="post">
                <h4 className="center">{sp.title}</h4>
                <p>{sp.body}</p>
                <button onClick={() => handleClick(sp.id)}>deletePost</button>
            </div>
        ) : (
            <div className="center">Loading posts...</div>
        );
    }
    return (
        <div className="container">
            {post(post_id)}
        </div>
    );
}

export default Post;

参考：

【讨论】：